// 人脸对比 URL
        String faceUrl = "https://aip.baidubce.com/rest/2.0/face/v3/match";
        try {
            String map = FileUtil.readFileAsString("./img.txt");
            System.out.println(map);
            String param = GsonUtils.toJson(map);

            // 注意这里仅为了简化编码每一次请求都去获取access_token，线上环境access_token有过期时间， 客户端可自行缓存，过期后重新获取。

            String result = HttpUtil.post(faceUrl, accessToken, "application/json", param);
            System.out.println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }

错误：result:{"error_code":222208,"error_msg":"the number of image is incorrect","log_id":2859295541,"timestamp":1525171479,"cached":0,"result":null}

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项目结构 

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img.txt 文件

[
    {
        "image": "https://ss0.baidu.com/7Po3dSag_xI4khGko9WTAnF6hhy/image/h%3D300/sign=15d5dd5200d79123ffe092749d355917/48540923dd54564e4d0d6963bfde9c82d1584f04.jpg",
        "image_type": "BASE64",
        "face_type": "LIVE",
        "quality_control": "LOW",
        "liveness_control": "HIGH"
    },
    {
        "image": "https://ss0.baidu.com/-Po3dSag_xI4khGko9WTAnF6hhy/image/h%3D300/sign=c2eaf2f9fa03738dc14a0a22831ab073/08f790529822720e77186fa377cb0a46f31fab91.jpg",
        "image_type": "BASE64",
        "face_type": "IDCARD",
        "quality_control": "LOW",
        "liveness_control": "HIGH"
    }
]

 这是什么问题呢